Réti Opening: Anglo-Slav Variation, London Defensive System

1.c4 Nf6 2.g3 c6 3.Nf3 d5 4.b3 Bf5

ECO A12

The Réti Opening: Anglo-Slav Variation, London Defensive System is a chess opening line in the Réti Opening complex, reached after 1.c4 Nf6 2.g3 c6 3.Nf3 d5 4.b3 Bf5.

It is catalogued under code A12 in the Encyclopaedia of Chess Openings (ECO).

The defining move Bf5 is chosen by Black on move 4.

Study this line with a grandmaster

This position is covered in the Reti Opening course: a GM-authored repertoire you study move by move, then practice against a human-like AI opponent.

Every chess term used here is defined in the chess terms glossary. Browse all opening courses or the full ECO code index.